Filter

Details Filter Filter

1997-02-13

1998-06-09

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327341, 327552, 333173, 330 9, H03K 500, H03F 100

Patent

active

057641005

ABSTRACT:
A transconductance filter (200) comprises multiple stages of a transconductor (110,120,130) having an input and an output, and a switch (260,265,270) coupled between the output and the voltage source. The switch is operatively responsive to the control signal for coupling and decoupling the voltage source directly to the output of the transconductor at least prior to the time the filter is required to filter the input voltage signal. The voltage source is within a predetermined input voltage range of the transconductor defined by a region in which a transconductance of the transconductor is substantially constant and positive.

REFERENCES:
patent: 4429281 (1984-01-01), Ito et al.
R. Schaumann et al., Design of Analog Filters: Passive, Active RC, and Switched Capacitor, pp. 308-313, 1990.

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